The shoshone tribal lands were originally reduced to a reservation with defined boundaries by the U.S. Congress in the Ft. Bridger Treaty of July 3, 1868. The Tribal government operates under a constitution approved by the Tribal membership that is the General Council, and is not under the Indian Reorganization Act of 1934. The Business Council of the tribe consists of a Chairman, Vice-Chairman, and four additional Council members that are elected by the Tribal members.